GDT Device: Recent Results and Future Plans for GDT Upgrade


GDT Device: Recent Results and Future Plans for GDT Upgrade

Ivanov, A. A.; Abdrashitov, G. F.; Anikeev, A. A.; Bagryansky, P. A.; Deichuli, P. P.; Karpushov, A. N.; Korepanov, S. A.; Lizunov, A. A.; Maximov, V. V.; Murakhtin, S. V.; Smirnov, A. Y.; Zouev, A. A.; Noack, K.; Otto, G.

GDT experiments of significance to a GDT based neutron source development are reported in the areas of generation of axially peaked neutron flux profile, stable confinement with on-axis plasma beta ~40%, and radial electric field control. Skew injection of 4 MW 15-17 keV deuterium neutral beams into central cell resulted in generation of strongly peaked axial profile of neutron flux density. This can be described by a model of fast ion relaxation, which involves classical mechanisms of electron drag and binary ion-ion collisions only. Experiments with the radial limiter biasing show that the plasma density profile and radial losses respond to the electric field profile. An increase of plasma energy was achieved with increased magnetic field in the central cell and optimised radial profile of electric field. In these regimes the on-axis plasma beta near the turning points of fast deuterons exceeded ~40%. The plans for future upgrade of the GDT device are discussed. It suggests considerable increase of NB injected power (up to 10 MW) and extension of the pulse duration from 1 ms up to 3-5 ms. After the upgrade, a significant increase of the electron temperature up to 250-300 eV could be obtained. Properties of the plasma with parameters approaching those in the full-scale neutron source are planned to study in experiments with NB injection into an additional mirror cell which will be installed near to one of the standard mirror coils.

Keywords: neutron source; fusion material research; gas dynamic trap; plasma; neutral beam injection; high-energetic deuterons; experiments; numerical calculations

  • Lecture (Conference)
    4th International Conference on Open Systems for Plasma Confinement, July 1-4,2002, Jeju Island, Korea, Proceedings in: Transactions of Fusion Science and Technology, 43 (2003) 51
  • Contribution to proceedings
    4th International Conference on Open Systems for Plasma Confinement, July 1-4,2002, Jeju Island, Korea, Proceedings in: Transactions of Fusion Science and Technology, 43 (2003) 51

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Publ.-Id: 5382